California, like most states allows motorists to consult paper-maps while driving -- a distraction that's considered dangerous, but at times necessary to motorists. However, the exact same act on the a mobile device -- which arguably take less finger dexterity -- is verboten.

This is okay, but using your smartphone is not. [Image Source: Petersen's 4 Wheel]

To be fair, the presiding Judge F. Brian Alvarez acknowledges that this cognitive dissonance between non-digital and digital uses exists in his ruling. However, he says that the 2008 law passed by California's state legislature and the follow-up 2012 hands-free bill are explicit -- no manual interaction with digital devices of any kind can be performed while driving.

He suggests that the Californian legislature review the issue and possibly modify the law.

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The decision isn't entirely catastrophic to motorists; barring reversal from the legislature, the ruling still leaves drivers with some legal options. Drivers can use hands free smartphone navigation software (which many phones now come with), although interacting with the device other than by voice is strictly illegal. California also allows automated self-driving cars, although they are not yet widely commercially available.

And of course there's one other option for California's motorists -- a good old-fashioned map.

So maybe you have a photgraphic memory, but when I have to get somewhere 100 miles away on some backroad in the middle of nowhere, there is no way I can look at a map one time before I leave my house and know every turn I have to make. This is just one example.

If you know your area and know basically where you have to get to, then sure looking at a map once before you leave can work. If you are going somewhere in an area you have never been, it is not very efficient to try and wing it.